intermittent No module named context_processors when using nginx/uwsgi

[Larry Martell]

Yes, the stack trace is from python, but I only get the issue using
nginx and uwsgi with the same django code.

As to your question, I have 2 different deployments of this app with
nginx and uwsgi. One is using django1.9 and python 2.7 and a single
uwsgi config and the second is using django2.0 and python 3.5 and does
have multiple uwsgi configs and I get this error on both.

On Sat, Jan 5, 2019 at 4:25 PM Robert Paprocki
<rpaprocki at fearnothingproductions.net> wrote:
>
> Given that the stack trace is from Python, it’s not an nginx configuration issue. Are you reverse proxying from nginx multiple uwsgi backgrounds that have different configuration?
>
>
> > On Jan 5, 2019, at 13:01, Larry Martell <larry.martell at gmail.com> wrote:
> >
> > I am having an odd interment django problem. I have an app which is
> > deployed at 30 different sites, some with apache and wsgi and some
> > with nginx and uwsgi. At only the nginx/uwsgi sites and only
> > intermittently, users will get the error No module named
> > context_processors.
> >
> > I am only posting it here because the issue only occurs when using
> > nginx/uwsgi and never with apache/wsgi. I have posted this to both the
> > Django group and stackoverflow, but had not received any help.
> >
> > It may happen on a page that was previously accessed with no error and
> > upon refreshing the same page it will come up fine. It will not occur
> > for months, then happen a few times in one day.
> >
> > Here is a typical traceback:
> >
> > Internal Server Error: /
> > Traceback (most recent call last):
> >  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/exception.py",
> > line 35, in inner
> >    response = get_response(request)
> >  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py",
> > line 158, in _get_response
> >    response = self.process_exception_by_middleware(e, request)
> >  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py",
> > line 156, in _get_response
> >    response = response.render()
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/response.py",
> > line 106, in render
> >    self.content = self.rendered_content
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/response.py",
> > line 83, in rendered_content
> >    content = template.render(context, self._request)
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/backends/django.py",
> > line 61, in render
> >    return self.template.render(context)
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/base.py",
> > line 173, in render
> >    with context.bind_template(self):
> >  File "/usr/lib/python3.5/contextlib.py", line 59, in __enter__
> >    return next(self.gen)
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/context.py",
> > line 246, in bind_template
> >    processors = (template.engine.template_context_processors +
> >  File "/usr/local/lib/python3.5/dist-packages/django/utils/functional.py",
> > line 36, in __get__
> >    res = instance.__dict__[self.name] = self.func(instance)
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/engine.py",
> > line 85, in template_context_processors
> >    return tuple(import_string(path) for path in context_processors)
> >  File "/usr/local/lib/python3.5/dist-packages/django/template/engine.py",
> > line 85, in <genexpr>
> >    return tuple(import_string(path) for path in context_processors)
> >  File "/usr/local/lib/python3.5/dist-packages/django/utils/module_loading.py",
> > line 17, in import_string
> >    module = import_module(module_path)
> >  File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
> >    return _bootstrap._gcd_import(name[level:], package, level)
> >  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
> >  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
> >  File "<frozen importlib._bootstrap>", line 956, in _find_and_load_unlocked
> > ImportError: No module named 'ui.context_processors'
> >
> > That file does exist and is readable:
> >
> > -rw-rw-r-- 1 ubuntu ubuntu 1059 May  2  2018 ui/context_processors.py
> >
> > And here is my TEMPLATES setting:
> >
> > TEMPLATES = [
> >    {
> >        'BACKEND': 'django.template.backends.django.DjangoTemplates',
> >        'DIRS': [
> >            os.path.join(BASE_DIR, 'ui/templates'),
> >            os.path.join(BASE_DIR, 'app/dse/templates'),
> >            os.path.join(BASE_DIR, 'core/reports/templates'),
> >        ],
> >        'APP_DIRS': True,
> >        'OPTIONS': {
> >            'context_processors': [
> >                'django.template.context_processors.debug',
> >                'django.template.context_processors.request',
> >                'django.contrib.auth.context_processors.auth',
> >                'django.contrib.messages.context_processors.messages',
> >                'context_processors.config',
> >                'ui.context_processors.navigation',
> >                'core.appmngr.context_processor',
> >            ],
> >        },
> >    },
> > ]
> >
> > As I said it's intermittent. Anyone have any ideas on what it could be
> > and/or how to debug it?
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